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TABLE 1 ' GROUNDWATER MONITORING DATA i Beacon Station No.12474 3440 East Main Street,Stockton,California . i i ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 1L (ug/L (u/L (ug/L (ug/Ll(ug/-L)I(ug/L) u1L (ug/L (ug/L (ug/L (ug/L jug/L)( u IL (feet) feet msl feet msl Comments MW-3 03/31/98 72 <0.50, <0:50 <0.50 <0.50 <5.0 no no na no na no na no 61.53 25.54 -35.99 screened 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns no na 58.85 -33.31 no comment interval 09!06198 ns ns ns ns ns ns ns ns ns ns ns ns na no 58.94 -33.40 no comment 75'-90' 12130!98 ns ns ns ns ns ns ns ns ns ns ns ns na no 56.96 -31.42 no comment 03!25199 73 <0.50 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 55.01 -29.47 no comment 06/03/99 65 <0.50 <0150 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 88 <0.50 54.39 -28.85 no comment 08!30!99 <50 <0.50 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 80 <0.50 56.61 -31.07 no comment 12/10/99 51 "<0.50 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 60 <0.50 56.47 -30.93, no comment 03!03100 <50 <0.50 <0!50 <0.50 <0.50 5.0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 32 <0.50 55.39 -29.85 no odor lno sheen 06122!00 <50 <0.50 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 21 18 <0.50 54.32 -28.78 no odor!no sheen 09128!00 <50 ,<0.50 450 <0.50 <0.50 <5.0 no no no na no no no no 56.71 31.17 no odor lno sheen 12/21100 <50 <0.50 <0!50 <0.50 <0.50 <5.0 no na na no na na no na 55.77 30.23 no odor!no sheen 03128101 <50 4<0.50 0.55 <0.50 <0.50 <5.0 no na no no na no na no 54.85 -29.31 no odor!no sheen 06127!01 <50 <0.50 ' 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 11 <0.50 56.45 -30.91 no odor 1 no sheen 09106!01 <50 <0.50 <0150 <0.50 0.83 <5.0 no na na na no na na na 58.49 -32.95 no odor 1 no sheen 12/03/01 <50 <0.50 0.54 <0.50 <0.50 <5.0 no no no no no na no no 58.92 -33.38 no odor I no sheen 03101!02 <50 <0.50 0.63 <0.50 <0.50 <5.0 no na na no no na na na 57.72 -32.18 no odor lno sheen 05/20/02 <50 <0-50 0.54 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 1.9 <0.50 58.04 27.52 -30.52 no odor lno sheen 08129/02 <50 <0.50 4,50 <0.50 <0.50 <5.0 no na na no no no no no 61.92 -34.40 no odor I no sheen 12/06/02 230 19 24 5.2 33 <0.50 na no no no no na no na 61.23 -33.71 odor/no sheen 03!07!03 160 <0.50 <0.'50 <0.50 <0.50 <5.0 na na no no na no no na 60.40 32.88 odorino sheen 06103!03 <50 .<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 59.17 -31.65 odor/no sheen 08128103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11125103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.31 -34.79 not sampled 03/01/04 110 1.3 2.9 <0.50 3.6 <0.50 <0.50 <0.50 <0.50 5.0 <50 <5.0 <0.50 <0.50 61.00 25.46 -35.54 no odorino sheen 06108!04 ns a ns ns ns ns ns ns ns ns ns ns ns ns ns 61.51 -36.05 not sampled 09/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 63.22 -37.76 not sampled 12108!04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 63.29 -37.83 not sampled 03/10/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05125!05 ns j ns ns ns ns ns ns ns ns ns ns ns ns ns { 60.85 -35.39 not sampled 09/01/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.71 -36.25 not sampled 12114105 ns ns ns ns ns ns ns ns no ns ns ns ns ns 61.90 X6.44 not sampled i 1' 14 a s ,s ^ 3 474gmA5. Pmlect Na.14 44.1 Page�JrCf 18 HORIZON�O r[HC. J i